Development and Testing of Re-Deployable Radiator for Deep Space Exploration Technology Demonstrator, DESTINY+

Abstract

A Reversible Thermal Panel (RTP) is a flexible re-deployable radiator that autonomously controls the temperature of a heat source. It promotes heat dissipation by deploying the radiator surface when the heat source is at high temperature. In a cold case, on the other hand, heat dissipation is saved by stowing the heat dissipation surface. As a feature of an RTP, it is possible to cope with a wide range of heat input without electric power by using a shape memory alloy (SMA) deployment and stowing. As the first case of an RTP space demonstration, it is planned to be installed in DESTINY+. DESTINY+ is a technology demonstration satellite to realize the future low cost, high frequency and sustained deep space exploration. It is necessary for DESTINY+ to remove concentrated heat generation from ion engines and increase the heat radiation amount. In this study, a 100W-class RTP breadboard model (BBM) was designed, fabricated, and tested. The deployment/ stowing test and thermal vacuum test were conducted and evaluation of design validity and model correlation are conducted by thermal analysis. The RTP-BBM consists of high-thermal-conductive graphite sheets as a flexible fin, and shape memory alloys as a temperature sensitive passive actuator. The deployment/stowing test was conducted in a thermal constant bath, and it was confirmed that the fins were deployed and stowed according to the SMA temperature. On the other hand, temperature hysteresis of up to +60°C was confirmed between heating and cooling. In the thermal vacuum test, a power step test and a power cycle test were conducted. It was found that the fins were deployed and stowed according to the temperature of the onboard equipment and autonomously controlled the temperature. In addition, the thermal analysis model correlated with the experimental results and showed that they were in good agreement within ±6°C.

Description

Yuki Akizuki, Nagoya University, Japan
Hosei Nagano, Nagoya University, Japan
Tomihiro Kinjo, Japan Aerospace Exploration Agency (JAXA), Japan
Kenichiro Sawada, Japan Aerospace Exploration Agency (JAXA), Japan
Hiroyuki Ogawa, Japan Aerospace Exploration Agency (JAXA), Japan
Takeshi Takashima, Japan Aerospace Exploration Agency (JAXA), Japan
Kazutaka Nishiyama, Japan Aerospace Exploration Agency (JAXA), Japan
Hiroyuki Toyota, Japan Aerospace Exploration Agency (JAXA), Japan
Kazuki Watanabe, WEL Research, Japan
Takeshi Kuratomi, WEL Research, Japan
ICES104: Advances in Thermal Control Technology
The 49th International Conference on Environmental Systems was held in Boston, Massachusetts, USA on 07 July 2019 through 11 July 2019.

Keywords

Deployable reactor, Thermal control, Thermal analysis, DESTINY+

Citation